Fire tube boiler



FIRE TUBE BOILER Filed July 24. 1925 2 Sheets-Sheet l x [um k l u /UW s. un 1 Viv; IN im N x QQ" A a n INVENQR BY .yl if ATTORNEYS Nov. 10, 1931. H. B. SMITH 1,831,549

FIRE TUBE BOILEH Filed July 24 1928 2 Sheets-Sheet 2 0 0 D 0 OOO OOO O Q0 OOO 0 UO O ,MEZ man? i. Q/V/ ATTORNEYS Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE HERMAN B. SMITH, OF PLAINFIELD, NEW JERSEY, ASSIGNOB T THE BA-BOOCK WI'LCOX COMPANY, 0F BAYONNE, NEW JERSEY, A CORPORATION OF NEW' JERSEY FIRE TUBE BOILEIB Application led July 24,

This invention relates to a novel and irnp'oved boiler of the fire tube t pe, and will best understood from the ollowng description.

In the accompanying drawings, in which I have shown a selected embodiment of the invention;

Fig. 1 is a vertical sectional view through the boiler and a furnace to which it is connected, and taken on the line 1--1 of Fig. 2.

Fig. 2 is a view taken on the line 2-2 of Fig. 1.

F ig. 3 is a view taken on the line 3-3 of i 1. ig. 4 is a view taken on the line 4 4 of The boiler of this invention may be used with any suitable source of hot gases, but is of articular use in connection withhot gases which are otherwise wasted. For the purposes of illustration, I have shown the boiler as used with a chamber 1 which may receive hot gases from an suitable source, the gases passing through t e iiue 2 to the boiler.

In the form shown, the boiler includes a cylindrical shell 3 having heads 4 and 5 adjacent the o osite ends thereof and covered with suitahlie heat insulation, as indicated. For the purpose of illustration I have shown a single shell, although if found desirable a plurality ma be used. Connected to the headsare a p urality of tubes 6 through which thegases from the flue 2 may pass. The heads 4 and 5 are preferably provided with llanges 7 extendin outwardl toward the ends of the shell, it ing notedy that the heads are spaced inwardly from the ends. This forms a construction in which the wall 8 of the fine may extend within the flange and thus form a tight joint with the boiler to prevent leakage of gas, and also to provide a rigid structure.

The space 9 surrounding the tubes 6 is the water space of the boiler, and communicates with a chamber 10 disposed above the shell. It will be noted that the boiler is inclined to the horizontal, and that the chamber 10 is disposed above the upper end of the boiler.

Extending transversely of the shell and intermediate its ends, is a cross drum l1 form- 1928. Seglal No. 294,972.

ing a steam and water drum into which steam and water from the chamber 10 may be discharged from a plurality of circulators 12. This drum is connected b a plurality of tubes 13 to a mud drum 14 isposed beneath the lower end of the shell and transversely thereof. This mud drum in turn has the connection 15 to the w'ater space 9 of the boiler.

The drum 11 has the usual steam outlet 16 and ma be provided with safety valves at 17, the va ves themselves being indicated in Fig. 4. The drum may also be supplied with the usual auge 18, to indicate the water level therein, t e normal water level being shown in Figs. 1 and 3 by the line 19. The feed water may-be admitted to the steam and water drum at the inlet 20, and the drum may be rovided with a suitable surface blow-o 21. A suitable manhole 22 may be provided for access to the boiler.

In operation, the boiler is filled with water to the approximate level shown, and hot gases are discharged through the fire tubes. The steam generated by the gases will pass into the chamber 10 and through the circulators 12 to the steam and water drum, this arrangement serving to separate out the water from the steam. The water from the steam and water drum will circulate downwardly through the tubes 13 to the drum 14, and thence upwardly to the lower portion of the shell 3 which portion it will be noted, is diagonally opposite the outlet from the shell. In this way a circulation through the entire boiler is caused. This arrangement prevents excessive variations in temperature, and thus reduces the strains due to expansion and contraction. By placing the drum 11 transversely of the inclined shell, much space is saved, particularly in head-room.

It will be noted that the heat for the Water in the shell is supplied entirely by the gases passing through the flue 2 and thence into the tubes in the shell. The shell is preferably covered with insulation as shown, as are also all the other parts, such as the cross drum, the mud drum, and the tubes 12 and 13. Therefore, the water is heated entirely by the fire tubes submerged therein, and all other tubes, more particularly water tubes and steam tubes, are protected from the action of the gases. The invention thus finds particular utility where waste ases are used, these waste gases often times eing dangerous and /or valuable, because containing valuable ingredients which can be recovered. The tight connection between the Hue and the shell, and the fact that the heat is taken from the gases entirely by their passage through tubes, insures that they do not escape.

While I have shown the invention as embodied in a specific form, it is to be understood that various changes in details may-be made without departing from the scope of the invention, and I therefore do notintend to limit myself except by the appended claim.

I claim In a boiler, a horizontally inclined shell having a water space therein, fire tubes extending through said space and normally submerged in the water therein, a hot gas flue, means forming a gas directing joint between said Hue and one end of said shell, whereby gases from the flue may pass through said tubes, a. steam and` water drum above said shell intermediate the ends of the shell and extending transversely thereof, a pluralityr of horizontally disposed tubes extending;r from the upper end of the shell at its top to -the side of the drum, and a plurality of tubes extending from the water space of the drum and connected to the lower end of the shell at the bottom thereof.

HERMAN B. SMITH.

and steam tubes, are protected from the ac. tion of the gases. The invention thus finds particular utility where waste ases are used, these waste gases often times eing dangerous and/or valuable, because containing valuable ingredients which can be recovered. The tight connection between the flue and the shell, and the fact that the heat is taken from the gases entirely by their passage through tubes, insures that they do not escape.

While I have shown the invention as embodied in a specific form, it is to be understood that various changes in details may-be made without de arting from the scope of the invention, and) I therefore do notintend to limit myself except by the appended claim.

I claim In a boiler, a horizontally inclined shell having a water space therein, fire tubes extending through said space and normally submerged in the water therein, a hot gas iiue, means forming a gas directing joint between said Hue and one end of said shell, whereby gases from the flue may pass through said tubes, a steam and: water drum above said shell intermediate 'the ends of the shell and extending transversely thereof, a plurality of horizontally disposed tubes extendingIr from the upper end of the shell at its top to 4the side of the drum, and a plurality of tubes extending from the Water space of the drum and connected to the lower end of the shell at the bottom thereof.

HERMAN B. SMITH.

CERTIFICATE OF CORRECTION.

Patent No. 1,831,549. Granted November l0, 193i, to

HERMAN B. SMITH.

lt is hereby certified that error appears in Vthe printed specification of the above numbered patent requiring correction as follows: Page 1, lines 40 and 46,

for the word "boiler" read shell; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 9th day oi February, A. D. 1932.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,831,549. Granted November l0, 193i, to

HERMAN B. SMITH.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page l, lines 40 and 46, for the word "boiler" read shell; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the ense in the Patent Office.

Signed and sealed this 9th day of February, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

